Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D231/00—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
  • C07D231/02—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings
  • C07D231/10—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
  • C07D231/14—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D231/44—Oxygen and nitrogen or sulfur and nitrogen atoms
  • C07D231/52—Oxygen atom in position 3 and nitrogen atom in position 5, or vice versa
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C309/00—Sulfonic acids; Halides, esters, or anhydrides thereof
  • C07C309/63—Esters of sulfonic acids

Definitions

• the present invention relates to a method for producing pyrazolinone compounds.
• pyrazolinone compounds represented by the following structures: (wherein iPr represents an isopropyl group, tBu represents a tert-butyl group, sBu represents a sec-butyl group and Me represents a methyl group: hereinafter the same) are known to have excellent plant disease controlling activity, and as a concrete method for producing the same, alkylation processes represented by the following schemes are known (JP-A-8-208621).
• an alkylated compound on a carbonyl oxygen at 3-position of a pyrazolinone ring (hereinafter, referred to as an O-alkyl compound) for example, a compound represented by the following structures: may be by-produced in a large amount in addition to a desired compound in which nitrogen at 2-position of a pyrazolinone ring is alkylated (hereinafter, referred to as a N-alkyl compound) (see, Comparative Examples 1 and 2 described below). It is an object of the present invention to provide a more advantageous production method for pyrazolinone compounds improving the yield and regioselectivity of the alkylation.
• R 1 is a hydrocarbyl group which may be substituted and which is selected from the group consisting of a C 1 -C 10 alkyl group (for example, an ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, sec-butyl group, 2-methylbutyl group, 2-ethylpropyl group and tert-butyl group), C 2 -C 10 alkenyl group (for example, 1-methyl-2-propenyl group), C 2 -C 10 alkynyl group (for example, 1-methyl-2-propynyl group), C 1 -C 10 alkyl group substituted with the same or different 1 to 21 halogen atoms, C 2 -C 10 alkenyl group substituted with the same or different 1 to 19 halogen atoms, C
• halogen atom a fluorine atom, chlorine atom, bromine atom, iodine atom
• C 1 -C 5 alkyl group for example, a methyl group and ethyl group
• C 1 -C 5 alkoxy group for example, methoxy group and ethoxy group
• C 1 -C 5 alkylthio group for example, a methylthio group and ethylthio group
• C 1 -C 5 haloalkyl groups preferably C 1 -C 2 haloalkyl group (for example, trifluoromethyl group), C 1 -C 5 haloalkoxy group, preferably C 1
• C 1 -C 5 haloalkylthio group preferably C 1 -C 2 haloalkylthio group: (for example, a trifluoromethylthio group) and a cyano group ⁇ , and a C 7 -C 17 aralkyl group which may be substituted with the same or different 1 to 5 substituents (for eample, a benzyl group, ⁇ -methylbenzyl group and ⁇ , ⁇ -dimethylbenzyl group) ⁇ which substituents are selected from the group consisting of a halogen atom (a fluorine atom, chlorine atom, bromine atom, iodine atom), C 1 -C 5 alkyl group: (for example, a methyl group and ethyl group), C 1 -C 5 alkoxy group (for example, methoxy group and ethoxy group), C 1 -C 5 al
• R 4 to R 8 may be the same or differentand are a hydrogen atom, halogen atom (for example, a fluorine atom, chlorine atom, bromine atom and iodine atom), C 1 -C 5 alkyl group (for example, a methyl group, ethyl group, propyl group, isopropyl group and tert-butyl group), C 1 -C 5 alkyl group substituted with the same or different 1 to 11 halogen atoms (for example, a trifluoromethyl group, tetrafluoroethyl group and heptafluoropropyl group), C 1 -C 5 alkoxy group (for example, a methoxy group, ethoxy group, propoxy group and isopropoxy group), C
• C 1 -C 5 alkylthio group for example, a methylthio group and ethylthio group
• C 1 -C 5 alkylthio group substituted with the same or different 1 to 11 halogen atoms for example, a trifluoromethylthio group
• cyano group nitro group
• phenyl group which may be substituted with the same or different 1 to 5 substituents, or phenoxy group which may be substituted with the same or different 1 to 5 substituents, ⁇ which substituents on the phenyl or phenoxy groups which may be substituted are selected from the group consisting of a halogen atom (a fluorine atom, chlorine atom, bromine atom, iodine atom), C 1 -C 5 alkyl group (for example, a methyl group and ethyl group), C 1 -C 5 alkoxy group ( for example, a methoxy group and e
• the present invention provides a method for producing a pyrazolinone compound represented by formula (I), which comprises reacting a lithium salt of a pyrazolinone compound represented by formula (II) with a sulfonic acid ester represented by formula (III) in the presence of an ether solvent (hereinafter, referred to as the present invention process).
• the present invention process is conducted by reacting the lithium salt of the pyrazolinone compound represented by formula (II) with the sulfonic acid ester represented by formula (III) in the presence of an ether solvent.
• the reaction temperature for this reaction is usually in the range of 60 to 150 °C, preferably 80 to 120 °C, and the reaction time is usually in the range of 1 to 12 hours.
• the amount of the sulfonic acid ester represented by formula (III) used in the reaction is usually from 1.0 to 5.0 mol, preferably from 1.1 to 2.0 mol based on 1 mol of the lithium salt of the pyrazolinone compound represented by formula (II).
• the ether solvent used in the present invention means a reaction solvent having at least one ether bond (-C-O-C-).
• the ether solvent include 1,4-dioxane, tetrahydrofuran, tetrahydropyran and diisopropyl ether, and 1,4-dioxane, tetrahydrofuran and tetrahydropyran are preferred.
• the present invention process can be conducted in the ether solvent alone or in the mixture of the ether solvent and another inert solvent.
• the mixed solvent usually contains the ether solvent in an amount of 50 vol% or more.
• the other inert solvent include, for example, aromatic hydrocarbons such as benzene, toluene, xylene and chlorobenzene and aliphatic hydrocarbons such as hexane.
• the concentration of the lithium salt of the pyrazolinone compound represented by formula (II) is usually 0.01 to 2 M, preferably 0.05 to 1 M in the reaction solution according to the present invention process.
• the pyrazolinone compound represented by formula (I) can be obtained by conducting usual work-up such as adding water to the reaction mixture after completion of the reaction, then, extracting the mixture with an organic solvent, and condensation by removing solvent. This compound can optionally also be purified by means of washing with an organic solvent, recrystallization and column chromatography.
• the sulfonic acid ester represented by formula (III) used in the present invention process can be prepared according to a method described in J. Org. Chem., (1970), 35(9), 3195.
• the lithium salt of the pyrazolinone compound represented by formula (II) can be produced by reacting the pyrazolinone compound represented by formula (II) with an anhydrous lithium hydroxide or lithium hydroxide monohydrate under azeotropic dehydration condition, or by reacting the pyrazolinone compound represented by formula (II) with lithium hydride, C 1 -C 6 alkyllithium (for example, buthyllithium and sec-buthyllithium) or lithium di(C 1 -C 6 )alkylamide (for example, lithium diethylamide and lithium diisopropylamide).
• C 1 -C 6 alkyllithium for example, buthyllithium and sec-buthyllithium
• lithium di(C 1 -C 6 )alkylamide for example, lithium diethylamide and lithium diisopropylamide.
• the range of the reaction temperature for this reaction is usually from 80 to 140 °C, and the range of the reaction time is usually from 0.5 to 12 hours.
• the amount of the anhydrous lithium hydroxide or lithium hydroxide monohydrate is usually from 1.0 to 5.0 mol, preferably from 1.1 to 2.0 mol based on 1 mol of the pyrazolinone derivative represented by formula (II).
• aromatic hydrocarbons such as benzene, toluene, xylene and chlorobenzene are listed.
• the range of the reaction time for this reaction is usually from 1 to 12 hours, and the range of the reaction temperature is usually from 60 to 120 °C when lithium hydride is used , and usually from -78 to 30 °C when alkyllithium or lithium dialkylamide is used.
• the amount of the lithium hydride, alkyllithium or lithium dialkylamide is usually from 1.0 to 2.0 mol based on 1 mol of the pyrazolinone derivative represented by formula (II).
• aliphatic hydrocarbons such as hexane, aromatic hydrocarbons such as toluene, or ethers such as diethyl ether, 1,4-dioxane, tetrahydrofuran and tetrahydropyran, diisopropyl ether are shown.
• the lithium salt of the pyrazolinone compound represented by formul(II) can be obtained by distilling the solvent off under reduced pressure from the reaction mixture after completion of the reaction.
• reaction solution after completion of the reaction can be used for the present invention process without further operation.
• the pyrazolinone compound represented by formula (II) used in the above-described production method can be prepared according to a method described in EP-679643-A.
• a reaction vessel equipped with a water separator was charged with 3.00 g of 1-tert-butyl-4-(2,6-dichlorophenyl)-5-amino-pyrazolin-3-one, 0.84 g of lithium hydroxide monohydrate and 15 ml of toluene, and the reaction mixture was stirred for 1 hour under azeotropic dehydration condition, then, toluene was distilled off under reduced pressure.
• a reaction vessel equipped with a water separator was charged with 3.68 g of 1-tert-butyl-4-(2-methylphenyl)-5-amino-pyrazolin-3-one, 1.26 g of lithium hydroxide monohydrate and 30 ml of toluene, and the reaction mixture was stirred for 1 hour under azeotropic dehydration condition, then, toluene was distilled off under reduced pressure.
• the pyrazolinone compound represented by formula (I) can be produced in high yield with high selectivity.

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• Plural Heterocyclic Compounds (AREA)

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• 1997
  • 1997-07-07 JP JP18106997A patent/JP4123542B2/ja not_active Expired - Fee Related
• 1998
  • 1998-05-09 KR KR1019980016624A patent/KR19990013367A/ko not_active Application Discontinuation
  • 1998-05-13 US US09/076,763 patent/US5869684A/en not_active Expired - Fee Related
  • 1998-07-02 IN IN1478MA1998 patent/IN186466B/en unknown
  • 1998-07-06 EP EP98112478A patent/EP0890573B1/en not_active Expired - Lifetime
  • 1998-07-06 DE DE69826933T patent/DE69826933T2/de not_active Expired - Fee Related
  • 1998-07-06 ES ES98112478T patent/ES2230636T3/es not_active Expired - Lifetime
  • 1998-07-06 CN CN98115908A patent/CN1101383C/zh not_active Expired - Fee Related

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